dark_jedi wrote: what in the world are you trying to accomplish with this?

Initially, this is being done to spot changes in the recent set. I don't have the visual knowledge of these films as many here do. Never watched them as a kid as we didn't have a VCR or laserdisc. So although i'm interested in the changes, I can't watch and spot, hey that's off. But as everything is digital can approach finding changes from a mechanical perspective. Let the computer figure it out. But right now don't know how to get the computer to spit out the information.

Here's the graph i'd like to get: (no spit takes!)

Taking two sources and 'Difference' blending mode them, returns mostly black screen, so the chart would flat line most of the time, and the spots where a revision has occured will spike the chart. Then just go to that spot in the video and see what's causing the anomaly. That's the identifying part.

The next part is where this could be helpful for people looking to de-evolve the films. As we are hearing AotC has been recolored. If this type of chart could be produced, my guess is the general settings for that color shift could be figured out and then unapplied to the film to take the BR and make it closer to the theatrical release. If 75% of a sequence of scenes has a blue shift of 20% (+/- 5%), that can be dialed back. The re-coloring projects have attempted this visually, this approach is numbers based.

If a full res DIF version is created, could be used as mattes to DeSpecialize things, or to create horrid video art.